let fs = require('fs');
fs.writeFile(__dirname + '/03-write.txt', '我是传智专修学院的大学生，我要好好学习', (err) => {});
fs.appendFile(__dirname + '/03-write.txt', '\n我是最棒的', (err) => {});
fs.readFile(__dirname + '/03-write.txt', (err, data) => {
    console.log(data.toString());
})